How can I compare two files in a batch file?

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-上瘾入骨i
-上瘾入骨i 2021-02-04 05:04

How can I compare two files in a batch file, and perform an action based on whether or not they match? I\'ve tried something like:

if file1.txt NEQ file2.txt got         


        
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  • 2021-02-04 05:19

    I use the below example to build reports based on file differences:

    set %Batch_Work_Space_Dir%=folder for your batch file and temp resource files
    set file_1=name of file
    set file_2=name of file
    
    fc %file_1% %file_1%t > %Batch_Work_Space_Dir%\Are_They_Different.txt
    
    powershell -command "(Get-Content %Batch_Work_Space_Dir%\Are_They_Different.txt) | select -skip 1 | Set-Content %Batch_Work_Space_Dir%\Are_They_Different.txt"
    set /p Diff_Found=<%Batch_Work_Space_Dir%\Are_They_Different.txt
    if %Diff_Found:~0,17%" == "FC: no difference" (
      execute commands
     )
    
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  • 2021-02-04 05:20

    It seems like the COMP program is actually fairly easy to use. See this question on Yahoo answers.

    Note that running comp /? will print the help text for the program (as does specifying the /? argument with any native Windows command line program). This outputs the same text you see in the answer of the question linked above.

    Content from the Yahoo Answer:

    C:\>comp /? 
    Compares the contents of two files or sets of files. 
    
    COMP [data1] [data2] [/D] [/A] [/L] [/N=number] [/C] [/OFF[LINE]] 
    
    data1 Specifies location and name(s) of first file(s) to compare. 
    data2 Specifies location and name(s) of second files to compare. 
    /D Displays differences in decimal format. 
    /A Displays differences in ASCII characters. 
    /L Displays line numbers for differences. 
    /N=number Compares only the first specified number of lines in each file. 
    /C Disregards case of ASCII letters when comparing files. 
    /OFF[LINE] Do not skip files with offline attribute set. 
    
    To compare sets of files, use wildcards in data1 and data2 parameters.
    
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  • 2021-02-04 05:30

    I believe you can use the "FC" command and then check the errorlevel. Here's some code:

    @echo off
    :main
    fc c:\filename r:\filemame > nul
    if errorlevel 1 goto error
    
    :next
    echo insert next CD
    pause
    goto main
    
    :error
    echo failed check
    

    (Pulled from http://www.computing.net/answers/dos/batch-file-command/15753.html)

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